| Yamtuan Besar Yang di-Pertuan Besar of Negeri Sembilan | |
|---|---|
State | |
 | |
| Incumbent | |
 | |
| Tuanku Muhriz, Yang di-Pertuan Besar of Negeri Sembilan since 29 December 2008 | |
| installation 26 October 2009 | |
| Details | |
| Style | His Royal Highness (Malay: Duli Yang Maha Mulia) |
| First monarch | Raja Melewar |
| Formation | 1773 |
| Residence | Istana Besar, Seri Menanti |
| Appointer | The Council of Undang Yang Empat |
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The Yamtuan Besar, also known officially as Yang di-Pertuan Besar and unofficially as Grand Ruler, is the royal title of the ruler of the Malaysian state of Negeri Sembilan. The Grand Ruler of Negeri Sembilan is elected by a council of ruling chiefs in the state, or the Undangs. This royal practice has been followed since 1773. The Yamtuan Besar is elected from among the four leading princes of Negeri Sembilan (Putera Yang Empat); the Undangs themselves cannot stand for election and their choice of a ruler is limited to a male Muslim who is Malay and also a "lawfully begotten descendant of Raja Radin ibni Raja Lenggang", the 4th Yamtuan.
This unique form of government later inspired the first Prime Minister of Malaysia, Tunku Abdul Rahman, to implement a form of rotational constitutional monarchy for a newly independent Federation of Malaya (now Malaysia). Thus, the office of Yang di-Pertuan Agong was created.